Black line(s) on screen - video card problem? or something else?

NTB

Diamond Member
Mar 26, 2001
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At work I've got a Core2-duo based PC running 64-bit Windows 7 and using an XFX Radeon 5570 HD for video. I was hoping to use eyefinity to drive 3 monitors (already have the required active DP-->DVI adapter), but I've got another issue to clear up first, and was wondering if anybody here had suggestions. Here's the problem -

Even with only 2 monitors attached, I get flashing, black lines across the screens in seemingly random locations: sometimes on one screen or the other, sometimes on both; sometimes right across the middle of the screen, and other times closer to either the top or the bottom. I've tried a couple different driver versions, and tried plugging the monitors into different ports on the card, all to no avail; the black lines still come and go as they please. I'm guessing I need a new card to get rid of this?

Nathan